Oil or gas fired cooking range



Nov. 23, 1943. E. WENANDER OIL OR GAS FIRED COOKING RANGE s sheets-sheet1 Filed Feb. 2:5, 1940 Nofv. 23, 1943. E. WENANDER 2,335,093

oIL oR @As FIRED cooxINe RANGE l Filed Feb. 23. -1940 :s sheetssheet 2.f4/evan 'ew Nov. 23, 1943. E, WENANDER 2,335,093

OIL 0R GAS FIRED COOKING RANGE 3 Sheets-Sheet 5 Filed Feb. 23, 1940 Nam,

Patented Nov. 23, 1943 OIL OR GAS FIRED COOKING RANGE Erik Wenander,Lund, Sweden Application February 23, 1940, Serial No. 320,500

In Sweden February 13, 1935 1 claim. (01.'126-39) that there will be aminimum of heat losses, all

in order to obtain a maximum of heat at the points of utilization.According to the invention the accumulator is supported by stays xed to`the upper portion of the framework and extendling from the lowerportion of the accumulator as well as by stays extending from the upperportion of the accumulator and xed to the lower framework of thecooking-range.

An oil fired cooking-range according to the invention is illustrated byway of example in the accompanying drawings.

Fig. l is a vertical section on line I-I of Fig. 2.

Fig. 2 is a vertical section on line II-II of Fig. 1, and

Fig. 3 is front view, partly in section, of a cooking-range, providedwith a baking oven without special source of heat.

i indicates a high temperature accumulator which is suspended bydiagonal stays 1i rigid with the framework 3 of the cooking-range insuch a way the upper portion of the framework is connected to the lowerportion oi the accumulator and 'the lower portion of the framework withthe upper portion of the accumulator. The high temperature accumulatoris made of a solid cast iron piece, in which there is a vertical channelextending from end to end for the passage of the combustion gasesgenerated by an oil burner provided below the high temperatureaccumulator. In order to obtain the highest possible temperature the oilburner preferably consists of a wick burner burning with a blue iame. Atthe top the channel 5 is adapted to be closed by a cover 6 so that thegases may be prevented from directly escaping. In the upper portion ofthe high temperature accumulator there is a channel communicating withthe channel 5. The channel l is connected with a low temperatureaccumulator by a pipe 8, and the combustion gases leave through thechannel l when the cover Ii closes the upper portion of the channel 5.In the pipe 8 there is provided a damper 9 so that the combustion gasesthrough the pipe may be regulated. The accumulator should be relativelyheavy in order to be able to accumulate as much heat as possible.However, this involves the drawback that the heating requires a verylong time to make the cooking-range effective. To eliminate thisdrawback there is provided in the channel 5 a pipe Ill through which thecombustion gases pass when the cover 6 Vcloses the channel. In this waythe gases are partly insulated from the cast iron mass so that arelatively great .part of the generated heat is rapidly supplied to thevessel to be heated which is placed on a sup.- Vport I2 which may beregulated from the front of the cooking-range by the handle I I andwhich is adapted to'be raised and lowered. I3 indicates a pipe directingthe combustion gases to the channel E from the source of heat. M isagua-rd plate.

The low temperature accumulator consists of an outer bowlshaped part I 5provided with a shoulder I6 upon which rests a shoulder Il of an innersolid cast iron core I8. The core I8 is so large and the shoulder I'l isso situated on the shoulder iE of the bowlshaped part that an annularchamber I9 is formed which at the bottom communicates with the pipe 8 byan opening 20 in the bowlshaped part I5 and atl the top communicateswith a discharge pipe 2I 'by another opening 22 in; the said bowlshapedpart. Con.- sequently, the combustion gases from the high temperatureaccumulator are forced to sweep the accumulator core I8 which is adaptedto be raised so that it will be easy to clean the annular chamber I9.The bowlshaped part I5 is iixed to the framework 3 by diagonal stays 4.

The discharge pipe 2| is divided into two branches 25 and 25communicating respectively with chamber 23 and 2d provided at the backof a hot-water container 23 and behind a warming cupboard 24respectively. In the branch there is provided a damper 26 for directingthe combustion gases to the branch tubes. The two chambers 23 and 24communicate with one another by a channel 24 and the chamber 23'communicates by a pipe 21 with the chimney. To increase the length oftravel of the gases in the chamber 24 a pair of baiiles 24" are providedtherein. The hot-water container and the warming cupboard are connectedwith the framework by the stays 4. The container is connected with thewater-conduit by the intake pipe 28 in which is provided a cock 28'.Further, there is a pipe 29 for drawing-off the heated water. 'I'heintake pipe 28 opens at the bottom of the container and the drawing-olipipe opens at the top of the container so that when water is supplied byopening the cock 28', said cold water raises the hot water and forces itthrough the draw-off pipe 28". Further, there is a cock 29 for liushingand cleaning the container.

In Fig. 1 Vthe baking oven 39 is shown provided with a special source ofheat. In the hollow space formed by an outer casing 3| and the bakingoven there are provided guide plates 32 dividing each of the verticalhollow spaces surrounding the oven into two chambers or channels towhich the combustion gases may be completely or partly directed bychanging the positions of turnable plates 33 and 34 located below thebaking oven by turningvoperating members 35 and 33.'

Each of the operating members 35 and 36 consists of a rotatable camengaged between arms attached to the related plate 33 or 34 so that whenthe cam is turned, movement is imparted to the plate. The baking oven isalso suspended by diagonal stays 4". The combustion gases leave throughthe pipe 31 direct to the chimney. Also, they may also be admitted intothe annular chamber I9 in the low temperature accumulator by a pipe 38opening into said annular chamber and communicating with the pipe 31.The combustion gases are directed selectively into the pipes 31 or 38 bya damper 39 pivoted at its upper edge at the connection betweenthe pipes31 and 38. 'Ihe gases entering the annular chamber from the pipe 38 arethen led through the pipe 2l Vpastthe warming cupboard 24 to the outtakepipe 21. 40 indicates a baffle plate. Above the source of heat there isthe pipe 4l leading the gases to the hollow space around the bakingoven. 42 indicates a guard plate.

43 indicates outer Vplates xed to the framework. Between theaccumulators, the baking ioven and the hot-water container and betweensaid members and the outer plates there are provided insulating layersof slag wool or some other suitable material. Due to the specialsuspension and insulation of the accumulators and the other members theouter heat losses will be very low. In order toinsulate theaccumulators, insulating covers 44', 45 are placed on the same. Thatside 46 of the covers which faces the accumulator is of asbestos or thelike, the others are of sheet metal, and the hollow space between themis filled with slag wool. At the top the accumulators are insulated fromthe top plate 41 of the cooking-range by rings 48 of asbestos or thelike.

For the cleaning (sweeping) of the oven there are provided suitable sootdoors. 53 indicates a door for the warming cupboard.

Fig. 3 shows a front view, partly in section, of a cooking-range havinga baking oven 30' which is notprovided with a special source of heat. In

Vthis case the combustion gases are supplied from the lower portion ofthe high temperature accumulator 2 through a channel 49 provided in theaccumulator and communicating with the channel 5. The channel 49communicates by a .pipe 50 with the hollow space between the casing 3l'and the oven 39'. In the pipe 50, there is a'damper 5l so that thecombustion gases may be led to the oven when said damper is open and thedamper 9 in the pipe 8 and the cover 6 in the upper portion of thechannel 5 are wholly or partly closed. Also in this case the combustiongases may be directed either direct to the chimney through the pipe 31,or they may be directed by the damper 39 through the pipe 38 to theannular chamber I9.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is:

An oil or vgasp fired cooking range comprising a frame, a metallichigh-temperature heat accumulator having a channel adapted to betransversed by combustion gases direct from a source of heat, a lowtemperature heat accumulator and a chamber surrounding the lowtemperature accumulator and connected with said channel,` a warmingchamber, a pipe Connecting the chamber surrounding the secondaccumulator with the warming chamber, a cooking oven and a pipeconnected with the lower portion of said channel for conductingcombustion gases to the exterior of said oven, said high and lowtemperature accumulators and said warming chamber being arranged side bysaid and said cooking oven being arranged between the high-temperatureaccumulator and the warming chamber and below the low-temperatureaccumulator.

ERIK WENANDER.

